The Mass Rearing Technique Of Predatory Bug, Orius Sauteri(Hemiptera: Anthocoridae)

As generalist predators, Orius spp. can prey on eggs and nymphs of thrips, aphids, spider mites, whiteflies, cotton bollworm, pink bollworm, plant louse, tobacco cutworm and some other small insects. They are considered as valuable natural enemies because of their wide distribution, strong adaptability, large population number and voracious characteristic in the fields. In this article, we researched on the key technique of ovipositional substrates, diets, breeding facilities and summarized the O. sauteri mass rearing technical process combining experiences of others. The main findings are as follows.(1) Filtration of the ovipositional substrates: Through observing oviposition place and oviposition selectivity of O. sauteri on kidney bean sprout, kidney bean leaf, horsebean sprout and soybean sprout in the laboratory, we obtained egg production of per-female, preoviposition period, ovipositional period , female longevity adult, egg production curve, the percentage of average egg production of per-female in the anterior 10 days to the total egg production of per-female and eclosion rate of O. sauteri on this four kinds of ovipositional substrates. The results showed that oviposition place of O. sauteri on kidney bean sprout was relative convergence, more than 90% of the eggs were lain on the shelter of intersection of the top leafstalk and stem and tender stem. In these four kinds of ovipositional substrates, O. sauteri had most strong selectivity on kidney bean sprout, mean daily egg production was 12.7,the most egg production of per-female was 68.3 and the least was 2.2. The oviposition period was concentrated and from the third day to twelfth day whose mean daily egg production were more than 2. The most percentage of the first 10 days to all life egg production was 88.3% and the most hatch rate was about 95%. At the same time we found that kidney bean sprout were not easy to sear and rot, so we can draw a conclusion that kidney bean sprout was the better ovipositional substrate for mass rearing of O. sauteri.(2) Filtration of diets for different instar of O. sauteri nymph: We selected leaf mites, torpid corn borers, soybean aphids and artificial diets to feed the sole new hatch nymph of O. sauteri and observed the influence of these four kinds of diet to the development period and mortality rate of different instar of O. sauteri nymph. The results showed that, fed by leaf mites, the period of the first, second and fifth instar of O. sauteri nymph were respectively 2.10 days, 2.00 days and 3.52 days. The time was the shortest in these four diets. The period fed by corn borers of the third and fourth instar of O. sauteri nymph were same as leaf mites and the time was shorter than other diets.